Tube welding



R. O. BERG TUBE WELDING Feb. 12 19240 Filed March 50 fatemen hairs Fee. 12, teas.

RICHARD O. BERG, F'DE'IRQI'I, MICHIGAN, ASSIGN OR TO MICHIGAN STEEL TUBE PBGDUCTS (10., OI DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN TUBE WELZDIN Application filed March 30, 1922. Serial No. 547,975.

' To 1/7/ whom it may concern-.'

. methods of welding tube with the oXy-aoetyinue flame is to use a long line of separate flames. it has also been found advantageous to use two separate lines of flame platwll on opposite sides of the edges of the tubing. llowcver. where two lines of flames .haxe been used these have always been directed against-the top of the tube to the inside of the edges of the tube. Ithas been the theory of operation to heat the edges of lholube by striking the metal to the inside of the edge so as not to drive the metal into the inside of the tube or let the jet go through the tube as is sometimes done with a single. line of that are lined up directly on the seam. Thus a two line of jet type of welding is very advantageou's in eliminating a burr on the inside of the tube and also in preventing bad welds by the force of the es blowing through the tube.

The present invention is a still further improvement, wherein a tip is used with jet openings substantially in line, but. the meth-' od of operation diiieis both from the common single line of jets and also from. the douole row of The jets are arranged to strike the tube obliquely so that the tirst jets that strike the tube. commonly known as the preheating jctls, strike the very edges of the tubing-in hut, they play directly on the exposed faces of the edges that. areto be welded. This secures a maximum heating e ti rct for the parts to be welded at a minimum use of gas. Near the rear end of the tip where the metal of the tube is converted into a molten state, the jets do not strike the faces of the exposed edges but strike slightly to the inside of the edges on opposite sides of the seam, so that where the metal is molten the jets do not tend to blow through-the tube or force the metal down to form an objectionable burr on the inside.

"lhese features will he more fully explained hereinafter.

In the drawings:

l is a plan View of the tip.

Fig. 2 is an end elevation of the tip.

Fig. 3 is a cross section of the tip taken on the line 3-3 of Fig. 1.

' Fig. 4 is a plan view'of the tube undergoing welding. i v

The tipis an ordinary blocktip made of suitable metal. (a designates an opening to receive the hollow shank containing the mixing chainber for the gases. This shank. is secured into the torch socket by a jam nut in a familiar way. It has been thought unnecessary to show these parts as they are well known in the art and are in no way claimed in this application. Through the tip from end to end is a bore plugged at the ends. This bore is the distributing passage tor the mixed oxygen and acetylene gases.

instead of boring jet passages through from the bottom of the tip up to the distributing passage 0 these passages designated e are bored on lines oblique to a plane perpendicular to thotube at the center of the seam. The are arranged in staggered relation, first directed obliquely to one side and next obliquely to the other side, as is shown in Figs. 1 and 2. However, the dis tributingends ot-the jet passages, are in line at the. bottom of the tip as shown in' Fig. l. The final or rear jet opening designated (Z is, however, bored straight up through the tip as shown in Figs. 1 and 3. This tipping or the jet openings results in the jets striking the work in the fashion shown in Fig. 2. The feed and the welding rolls are so adjusted that" when the tube reaches the first jets, or the preheating jets, there is quite a space between the meeting edges. These preheating jets being directed on oblique lines strike the exposed faces of the separated edges, in place of striking the top 01 the tube, although part of the jet As the tube passes under the succeeding jets the welding rolls are adjusted to face the edges together so that the jets that render the metal soft and molten strike the tube on the top to the inside oi the edges so that the force of the gas will not blow through the soft portion of the tube but will tend. to puddle the metal. from opposito and tend to flow it togeilier over the seam. The lost jet strikes the sw m at the center so as to level the ridge Eliot would 5 otherwise occur from flowing the metal together from opposite sides What ll claim is: 1. A welding tip having a relatively large number of jet passages having she jet pas sages drilled obliquely to both sides of a plane rumiiiig longitudinally of the bottom of the tip and perpendicularly thereto, all of said. jet passages having discharge openings arranged in line, aml coinciding with said longitudinal plane.

2. A. welding tip; comprising a. block havi'ng jet passages drilled obliquely to a glam, running longitudinally of the bottom oi the tip and perpendicular to tho bottom of the tip, the jet passages alternating obliquely to one side and than. to the other of the said perpendicular plane.

3. A welding tip comprising a block hming a relatively large number of jet passages having their discharge ands arranged in lino but drilled obliquely to 9, plans runoing longitudinally of the bottom of the ii;

perpendicularl to such botton1,succeedi1ig passageways alternating 1m obliquity on upposite sides of said plane.

tsp. comprising a block hav- 5. A avoiding ing a, plurality of 1st passages and having their delivery ends in line but drilled 0b liquely to a piano running longitudinally to the bottom of the tip but perpendicular to saifi bottom, the said jet passageways alternating obiiquoly first to one side than to the other 03": she plane, ths'said block provided with an additional final jet opei'iing lying directly in said. perpendicular plane.

ln fiestimony whereof I sffix my signature.

EICHARD O. BERG.

the tip but i 

